The QM3404K from uPI Semiconductor is a MOSFET with Continous Drain Current 3.1 to 3.9 A, Drain Source Resistance 32 to 47 milli-ohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.5 to 1.2 V. Tags: Surface Mount. More details for QM3404K can be seen below.